{"paper":{"title":"Generalizing the CPL Parametrization through Dark Sector Interaction","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"Interacting dark energy models generalized with a specific coupling kernel and CPL parametrization are not preferred over LambdaCDM by Bayesian evidence despite some frequentist tensions.","cross_cats":["gr-qc"],"primary_cat":"astro-ph.CO","authors_text":"Mikel Artola, Ruth Lazkoz, Vincenzo Salzano","submitted_at":"2026-04-28T08:38:43Z","abstract_excerpt":"We investigate a hierarchy of interacting dark energy (IDE) models featuring a non-gravitational coupling between dark matter and dark energy. Specifically, we examine scenarios where the background interaction kernel, $Q = 3H(\\delta + \\eta a)\\rho_\\mathrm{de}$, allows for both constant and dynamical coupling parameters. Adopting the Chevallier-Polarski-Linder parametrization for the dark energy equation of state, $w_\\mathrm{de} = w_0 + w_a(1-a)$, we derive closed analytical expressions for the energy densities of dark matter and dark energy. Afterwards, we obtain observational constraints usin"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"Ultimately, our Bayesian model comparison reveals that no investigated IDE scenario is statistically preferred over the concordance ΛCDM model.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The specific background interaction kernel Q = 3H(δ + η a)ρ_de is assumed to permit closed analytical expressions for the dark matter and dark energy densities while remaining physically motivated.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"Dynamical couplings in interacting dark energy models reduce deviations from LambdaCDM to 1.3-1.5 sigma and yield no Bayesian preference over the standard model.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"Interacting dark energy models generalized with a specific coupling kernel and CPL parametrization are not preferred over LambdaCDM by Bayesian evidence despite some frequentist tensions.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"9ad80c75c39157a1dcbaef8b6369a66258e2ecfed60fb8fc68c8972e21096e67"},"source":{"id":"2604.25373","kind":"arxiv","version":2},"verdict":{"id":"04c362ad-cbbf-42b1-ad3e-6074b123f37e","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-07T15:06:09.105636Z","strongest_claim":"Ultimately, our Bayesian model comparison reveals that no investigated IDE scenario is statistically preferred over the concordance ΛCDM model.","one_line_summary":"Dynamical couplings in interacting dark energy models reduce deviations from LambdaCDM to 1.3-1.5 sigma and yield no Bayesian preference over the standard model.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The specific background interaction kernel Q = 3H(δ + η a)ρ_de is assumed to permit closed analytical expressions for the dark matter and dark energy densities while remaining physically motivated.","pith_extraction_headline":"Interacting dark energy models generalized with a specific coupling kernel and CPL parametrization are not preferred over LambdaCDM by Bayesian evidence despite some frequentist tensions."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2604.25373/integrity.json","findings":[],"available":true,"detectors_run":[{"name":"doi_compliance","ran_at":"2026-05-19T21:12:33.671045Z","status":"completed","version":"1.0.0","findings_count":0}],"snapshot_sha256":"68f295e16cc96a14df05d78e0656f307517d42c4dd38adae9a7b1e25ced4eb52"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}